总线选择时约定命令控制字为0feh。

When selecting bus, the control word is 0feh.

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控制字是一种特殊的RTF用来标记打印机控制符的格式化命令，也是程序用来管理文档样式的格式化信息。

A control word is a specially formatted command that RTF USES to mark printer control codes and information that applications use to manage documents.

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上位机基于CF接口与下位机进行数据通信，给下位机发送量程控制字、数据采集参数等命令，采用中断方式接收下位机采集过来的数据并进行处理，下位机只完成数据的采集。

Host accesses client's data across CF interface, sends instructions to client such as range select word and DAQ parameter, data are sent to host in interrupt mode and then processed.

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上位机基于CF接口与下位机进行数据通信，给下位机发送量程控制字、数据采集参数等命令，采用中断方式接收下位机采集过来的数据并进行处理，下位机只完成数据的采集。

Host accesses client's data across CF interface, sends instructions to client such as range select word and DAQ parameter, data are sent to host in interrupt mode and then processed.

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